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Wetlands have many functions that are beneficial. This module will discuss the following functions of wetlands: 1  wetlands filter harmful substances. 2  wetlands protect against floods. 3  wetlands protect against erosion.4  wetlands provide food and habitat.5  wetlands save people money.his module will discuss the following functions of wetlands: 1  wetlands filter harmful substances. 2  wetlands protect against floods. 3  wetlands protect against erosion. 4  wetlands provide food and habitat.
Wetlands, rivers, lakes, and coastal estuaries are all aquatic ecosystemsâcritical elements of Earthâs dynamic processes and essential to human economies and health. Wetlands connect land and water, serving as natural filters, reducing pollution, controlling floods, and acting as nurseries for many aquatic species.earning more about the ecosystems within your watershedâall the water in your region that drains to the same pointâcan help you better understand how everything is connected and what is at stake with freshwater overuse, pollution, and drought.